Also more robust FM behaviour

Fix PW sign

Few optimisations

* Added MotionMTR 
* Improve Muxlicer docs and knob labels
* PonyVCO - update DC blocker to RC filter, avoids NaNs at high sample rates (fixes #41 #40 )

Fixes #40 #41

* Added Pony VCO
* Improve Oversampling filter code
* remove DC from EvenVCO pulse
* Fix #37 DC on saw based waves
* update README with hardware differences
* Fix CPU spike with StereoStrip, fixes #39

* addressing feedback from Andrew
* add optional saturation to outputs
* added linear clipped panning law

* Noise Plethora
  * Initial release
* Chopping Kinky
  * Upgraded to use improved DC blocker
* Spring Reverb
  * Added bypass
* Kickall
  * Allow trigger input and button to work independently
* EvenVCO
  * Fix to remove pop when number of polyphony engines changes (Fixes #33 )
* Muxlicer
  * Chaining using reset now works correctly (Fixes #32 )

Removed unused Button/Knob

* simpler method adopted (pointer vs producerMessage etc)
* better tooltips

Muxlicer:
* address in can only adjust step on clock ticks

* changed polyphony logic (we don't want to "broadcast" monophonic
  channels in the mixer, as downstream these will be summed via
  getVoltageSum, see e.g. VCMixer in Fundamental)

* ADSR: added missing .svg, and removed unused variable

* more efficient crossfade function
* correcting crossfade CV logic
* added "differences from hardware section"

Signed-off-by: hemmer <915048+hemmer@users.noreply.github.com>